Albert j



(No Model.)

A. J. DOTY.

GAS BURNER FOR STOVES OR OTHER HEATERS.

No. 443,221. Patented Dec. 23, 1890.

WITNESSES.

UNITED STATES EErcE,

PATENT ALBERT J. DOTY, OF NE\V YORK, N. Y.

SPECIFICATION forming part of Letters Patent No. 443,221, dated December 23, 1890. Application filed January 3,1890. Serial No. 335,777. (No model.)

To all whom, it may concern:

Be it known that I, ALBERT J. DOTY, a citizen of the United States, and a resident of New York city, in the county and State of New York, have invented new and useful Improvements in Gas-Burners for Stoves or other Heaters, of which the following is a specification.

My invention relates to steam-mgector gas: burners more particularly designed for cock ing and heating stoves, but applicable also for boiler and other furnaces. The particular object of the improvement is to provide bu rners for places where gas is furnished at low pressure from the street-mains, and steam is available for supplying the injecting force, as for the cooking-ranges of hotels, restaurants, and the like, and such as will in such conditions effect more intimate mixture of the gas and air, and thereby produce better and more effective combustion than is now attained in such burners; and the invention consists of the improved construction and arrangement of the burner hereinafter described and claimed, reference being made to the accompanying drawings, in which Figure 1 is a longitudinal section of my improved burner, and Fig. 2 is an end elevation of the issue-nozzle.

In the front end of a hollowcylindrical gasreceiving chamber a, having a contracted neck 1) leading to the issue-nozzle, I arrange the steam-nozzle d centrally, and the larger surrounding and tapering air-inlet nozzle 6, with the gas-supply pipe 0 entering through the side of the chamber, the arrangement being so that the air-nozzle e extends along the chamber nearly to but terminates a little short of and leaves an annular space at a point where the sides of the reduced section terminating in the neck converge in the said neck, whose inner circumference is only a little larger than the mouth of the air nozzie 6, while the steam-nozzle terminates at a suitable distance short of the mouth of the airnozzle for causing the induced current of air to impinge effectually on the steam-jet prior to the issue from the air-nozzle into the mixing-chamber beyond, which conditions effect better mixture of the gas and air, as I have practically demonstrated, and thus produce a burner superior to other burners of the kind now in use.

I have found it productive of much the best results in thiskind of burner tobring the steam and air together first through the tapering airinlet nozzle, concentrating the air around the steam-jet and extending a short distance beyond the steam-nozzle, and subsequently to bring the gas to the combined steam and air, as I have thus shown and described my invention to be specially provided for, and this I believe is the essential merit of it. It seems to accomplish more nearly than any other the requisite thorough intermixture'of due proportions of oxygen and gas which their chemical affinities demand for best combustion.

Over the inlets gin the front end of the air nozzle I provide a register m to regulate the quantity of air admitted, and in the steamnozzle I arrange the regulating-plug p. The steam and gas pipes will be connected with a steam-boiler and gas-main, respectively, and will have suitable stop-valves for regulating the quantities.

Forthe issue-nozzle I provide the shallow cup-shaped mouth 0 of the neck I), and insert therein a distributing and spirally-deflecting rose-cover consisting of a plate h, closing the cup-mouthexcept at the series of radiallyarranged spirally-deflecting slot-openings 1', formed in the cover-plate and having such inclination in a spiral direction and radial breadth as to produce a vortex of flame having considerable diameter and adapted to produce incandescents in a bed of refractory material, by which the heat may be practically distributed over a large area, like a coal-fire.

If desired, the combining-chamber a may have two or more gas-inlets 0 on opposite sides.

I am aware of the Patent No. 370,251, in which a hot blast of air is discharged through a small nozzle to produce the jet for introducing the gas, and a mixed jet of oil-spray and steam is introduced into the hot blast before it combines with the gas; but this is not a device capable of supplying the requisite air from the atmosphere to provide a burner for an ordinary stove, which is the kind of burner that I seek to provide. The air-nozzle in that case is contracted to produce a forcible jet of compressed air, and if open to the atmosphere ICO at the receiving end could not with the steamnozzle supply air sufficient to support combustion.

I am also aware ot' the Patent No. 829,7 7 6, in which there is an air-inlet tube of uniform size of bore to admit a partial supply of air to a jet of natural gas of such high pressure as to need no other impellin g force except for temporary use, and being an arrangement not adapted foran eflicient burner of gas supplied from the low pressure of the main, while the special arrangement claimed in my burner is highly eflieient in such condition.

I am also aware of the British patent, No. 1,403, of March 23, 1882, in which the gas is induced by a jetof compressed air and brought into other air induced by the compressed-air jet, whereas my burner is contrived for cool;- ing-ranges of hotels and the like when steam is available; but compressed air is not for the inducing-j et, and is therefore constructed with the steam-nozzle, air-inlet nozzle, and the gassupply, all so that a steam-jet in the air-nozzle will introduce the air in the proper quantityand in the particular relation to the steam and gas which I have described and shown, and whereby I have provided a practically effective burner under the conditions stated.

I am also aware of the patent, No. 379,879, on a liquid-fuel burner, in which there is a tapered air-inlet nozzle terminating at the inner end in a short flaring burner-mouth and surrounded back of said flaring mouth with an oil-vaporizing jacket, from the inner end of which a few small perforations through the air-nozzle issue at the junction of it with the burner to admit the oil'vapor of high pressure to the air, and in which there is a short steam-injector nozzle terminating at the middle of the length of the air-nozzle and having several small diverging issues adapted to dis tribute the steam laterallyin several fine jets for mixing steam with the air,but would have little effect as an injector of gas from the street-main, the gas being in j eeted by its over pressure. Such burners would not be available for gas, and oil-burners are objectionable for cooking-ranges on account of the bad smell, the high tension of the vapor necessary for good combustion, greater difliculty 0t regulating them, and the roaring noise of the flame caused by the high tension of the vapor.

I claim as my invention- 1. A steam-injector burner for utilizing gas of low pressure from the street-mains and air of atmospheric pressure, consisting of the following elements only, viz: the gas-receiving chamber ,taper air-inlet nozzle, steam-injector nozzle, and the conducting-pipe leadiu g to the lmrner-nozzle and being combined and arranged as follows: said gas-receiving chamber having the contracted neck merging in the conducting-pipe leading to and terminat ing in the burner, the taper air-inlet nozzle open at the outer end to the atmosphere and extending along said gas-receiving chamber to and opening into space in said neck, adapted in the annular portion surrounding the end of the air-nozzle for the induction of the gas of low pressure from the street-main by the steam-jet, and the steam-injector nozzle entering and extending along the air-nozzle nearly to but terminating a little short of the inner end of the same.

2. The combinatiomwith the injecting, mixing, and combining chamber, of the roseburner consisting of the cup-shaped mouth of the burner-tube and the cover fixedly attached an d having the spirally-deflecting slots formed in the plate of the cover,substantially as described.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of two witnesses, this 9th day of December, 1889.

\Vitnesses:

WILFRED B. EARLL, W. J. MORGAN. 

